From 4345b32f974c36dd758673d020c0ec0503d7f24c Mon Sep 17 00:00:00 2001
From: Frank <91616163+softhack007@users.noreply.github.com>
Date: Mon, 22 Dec 2025 18:33:46 +0100
Subject: [PATCH] protect WS2812FX::resetSegments boundsOnly path

the "boundsOnly" case can lead to ldsrgb re-allocation - better to protect it with segmentMux, too
---
 wled00/FX_fcn.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/wled00/FX_fcn.cpp b/wled00/FX_fcn.cpp
index 563ff11d..d33843cb 100644
--- a/wled00/FX_fcn.cpp
+++ b/wled00/FX_fcn.cpp
@@ -2405,6 +2405,8 @@ void WS2812FX::resetSegments(bool boundsOnly) { //WLEDMM add boundsonly
     _mainSegment = 0;
     esp32SemGive(segmentMux);
   } else { //WLEDMM boundsonly
+    // WLEDMM protect against parallel access while drawing
+    if (esp32SemTake(segmentMux, 2100) != pdTRUE) return;  // wait long, but don't wait forever
     for (segment &seg : _segments) {
       #ifndef WLED_DISABLE_2D
       seg.start = 0;
@@ -2417,6 +2419,7 @@ void WS2812FX::resetSegments(bool boundsOnly) { //WLEDMM add boundsonly
       #endif
       seg.allocLeds();
     }
+    esp32SemGive(segmentMux);
   }
 }